Furnace.



P. H. MAGIRL.

FURNACE.

APPLICATION FILED MAY 5. i915.

1 163 676,- Patented Dec. 14, 1915. 9 2\\ Q? 2 SHEETS-SHEET 1.

COLUMBIA PLANOGRAPH C0.. WASHINGTON. u. c.

P. H. MAGIRL.

FURNACE.

APPLICATION FILED MAY 5. I915.

Patented Dec. 14, 1915.

2 SHEETSSHEET 2.

QHoz we L 3 PATRICK MAGIRL, 0F BLOOMINGTON, ILLINOIS.

summon.

Application filed May 5, 1915.

- shaped ends 22 of the fines 23. The flues 23 To all whom it mayconcern:

Be it known that I, PATRICK H. MAGIRL, a citizen of the United States,residing at Bloomington in the county of McLean and State of Illinois,have invented certain new and useful Improvements in Furnaces, of whichthe following is a specification.

This invention relates to furnaces for warming air and the principalfeatures of novelty are the use of a doubleor divided rear breeching andin the arrangement of the direct draft in connection with the rearln'eeching.

A. furnace embodying thev invention is illustrated in the accompanyingdrawings, in which i Figure 1 is a vertical longitudinal section of thefurnace, the casing being omitted; Fig. 2 is a vertical transversesection looking toward the rear and showing the rear breeching, the lineplates and the direct draft connection; Fig. 3 *is an enlarged sectionthrough the direct draft fine on the line 3-3 of Fig. ,2; Fig. 1 is anenlarged section through a direct draft fine the section being taken onthe line 4-4 of Fig. 3; Fig. 5 is an enlarged axial section of one ofthe main flues showing the 'onnecting joints with the front and rearflue plates; and Fig. 6 is a fragmentary View looking at the left end ofthe flue shown in Fig. 5.

The furnace shown in the drawings is usually inclosed in a brick orother casing which confines the air to be heated and causes it to flowin contact with the fire box and lines. This casing being common in theart is not illustrated. The furnace has the usual front 11 of cast ironprovided with the usual fuel door 12 and ash pit door 13 as well assuitable cleanout openings (not shown). To the front 11 are bolted thecastings forming the fire box 1 1 and ash pit 15, the surfaces of thefire box walls being corrugated to increase their surface.

Leading from the rear of the fire-box 14 are two fire box extensions 16also provided with corrugated surfaces and these extensions terminate inthe breechings 17 which are spaced apart. These breechings aresemicircular in side elevation and project upward beyond the fire-boxextensions 16 and carry on their forward sides the flue plates 18. Theseare provided with flue openings 19, which are provided with spacedannular flanges 20 and 21 for receiving the bell Specification ofLetters Patent.

Patented Dec. Tia, isis.

Serial No. 26,027.

are held in sealing relation with the plates 18 by means of collars 24':and bolts 25 as most clearly shown in Fig. 5. Asbestos or other packing26 is used at the point indicated to secure a gas tight joint.

The lines 23 extend forward from the breechings 17 over the fire box 14and its extensions 16 and enter a smoke box or manifold 27 bolted to thefurnace front 11 .as clearly shown in Fig. 1. The forward ends of thelines 23 are provided with spaced annular flanges 28 and 29, the endflanges 28 being small enough to pass through the flue openings 30 inthe smoke box 27. The other flanges 29 bear against the wall of thesmoke box around the opening 30 and pro duce a sealed joint. Flanges 31surrounding the flue openings 30 hold the flues 23 centered and aid inretaining packing 32. Externally threaded divided sleeves 33 are placedaround the ends of the fines 23 behind the flanges 28 and nut rings 3%threaded therein hold the parts of the sleeves in assembled relation andforce them against flanges 28 to produce the necessary joint sealingpressure.

There are three of the fines 23 leading from each breeching in thefurnace illustrated, but the number is not material and will varyaccording to the size and purpose of particular furnaces.

A horizontal smoke pipe 35 leads from the smoke box 27 to the uptake 36at the rear of the furnace. Alined with the uptake 36 is a direct draftpassage 37 and this is connected by a Y connection 38 to the twobreechings 17. The Y connection 38 is placed between the breechings l7and is connected to them and to the direct draft passage 37 by a specialform of joint illustrated in Fig. 4. The abutting ends of the fines allhave inter-engaging flanges 39 and these are clamped in en agement bydivided encircling rings 40 U-shaped in cross section the two parts ofwhich are hinged together at 4.1. A bolt 42 is provided to hold therings clamped around the lines.

The direct draft is controlled by a sliding damper 43 which is actuatedby a rod 44 leading through pipe 35 to the front of the furnace.

The construction described permits ready replacement of parts, securesgas tight joints at all points and simplifies the construction offurnaces of this type. The location of the direct draft at the rear isan important improvement, the direct draft in this type of furnacehaving heretofore been located in the top of the fire box at the front.The improved construction avoids the short circuiting of the entireheating surface by the direct draft which necessarily occurs in priorstructures, and yet secures a wholly satisfactory direct draft.

Having thus described the invention, what I claim is 1. In a furnace,the combination of a fire box; a pair of breechings spaced apart andcommunicating with the rear of the fire box; an uptake adjacent saidbreechings; a heat radiating flue structure communicating with saidbreechings and uptake; a direct draft connection mounted between saidbreechings and communicating therewith and with said uptake; and adamper for opening and closing said direct draft connection.

2. The combination with a furnace in cluding a fire-box, a pair ofspaced breechings communlcatmg therewlth and an up-.

Oopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

take adjacent said breechings; a heat radiating flue structurecommunicating with said breechings and uptake; a flanged Y connectionmounted between said breechings and communicating therewith and withsaid uptake; and clamping rings U-shaped in cross section engaging theflanges of said Y connection for holding the same in close connectionwith said breechings and uptake.

4:. In a furnace the combination of a fire box; two horizontal fire boxextensions projecting rearwardly therefrom; a pair of )reechings oneapplied to the rear of each of said fire box extensions, the extensionsand breechings being respectively spaced apart to permit the passage ofair between the same; heat radiating flue structures, one extendingforward from each of said breechings above said extensions and fire box;a forward smoke box connecting with said flue structures; an up-take atthe rear of the furnace; a smoke pipe mounted between said fluestructures and connecting the smoke box to said up-take; a Y-connectionmounted between said breechings and offering a communication direct fromthe same to said uptake; and a damper controlling the last namedconnection.

In testimony whereof I have signed my name to this specification.

PATRICK H. MAGIRL.

Washington, D. G.

